Femur stem



FIG. 1 is a perspective view showing the front, top and left sides of the femur stem;

FIG. 2 is a front elevation view of the femur stem;

FIG. 3 is a right side elevation view of the femur stem, the left side elevation view being a mirror image therof;

FIG. 4 is a rear elevation view of the femur stem;

FIG. 5 is a top plan view of the femur stem; and,

FIG. 6 is a bottom plan view of the femur stem.

The dotted line depictions in the drawings depict a portion of the femur stem that does not form a part of the claimed design. The stippled shading constitutes a contrast in appearance. 

CLAIM The ornamental design for a femur stem, as shown and described. 